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High-bending-resistance cement-based material and preparation method thereof

A cement-based material, high flexural resistance technology, applied in the field of concrete, can solve the problems of reducing the compressive strength of cement matrix, reducing the compressive strength of cement-based materials, poor flexural and tensile properties, etc., to avoid polymerization, reduce The effect of slippage and improvement of flexural strength

Inactive Publication Date: 2020-08-11
UNIVERSITY OF MACAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Polymer-cement composites have high toughness, strain and flexural strength, but the addition of polymers tends to significantly reduce the compressive strength of cement-based materials. When the composite is subjected to a compressive load, the polymer in the polymer Chains can slip in the cement matrix, reducing the compressive strength of the cement matrix
Ordinary concrete has poor flexural and tensile properties, which makes it necessary to be applied to building structures under the condition of steel reinforcement, which greatly limits their practical application

Method used

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  • High-bending-resistance cement-based material and preparation method thereof
  • High-bending-resistance cement-based material and preparation method thereof
  • High-bending-resistance cement-based material and preparation method thereof

Examples

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preparation example Construction

[0028] It should be noted that this preparation method can make the prepared high molecular polymer and cement hydrate chemically bonded, so that the polymer does not exist as a separate polymer phase in the cement hydrate, basically avoiding the The polymerization of polymers, while reducing the slippage between polymer chains, effectively improves the flexural strength of cement-based materials. Specifically include the following steps:

[0029] S1, preparation of reaction solution

[0030] The polymerization monomer, initiator and accelerator are mixed and dissolved in water to obtain a reaction solution, and the reaction chemical raw materials are dissolved and mixed first, so that they can be mixed more uniformly when subsequently mixed with cement.

[0031] Preferably, the mass ratio of polymerized monomer to cement is 0.5-7:100; the mass ratio of initiator to polymerized monomer is 0.3-0.6:100; the mass ratio of accelerator to polymerized monomer is 0.001-0.018:100. T...

Embodiment 1

[0047] This embodiment provides a method for preparing a high-bending cement-based material, comprising the following steps:

[0048]At 20°C, add 0.3g of acrylamide (AM) into water, stir until the acrylamide is completely dissolved, then add 0.0009g of ammonium persulfate and 0.000003g of N,N,N',N'-tetramethyl-ethanedi amine, and stirred at room temperature for 10 minutes to obtain a transparent aqueous solution of acrylamide with a mass fraction of 0.3%.

[0049] Under the condition of 20° C., the prepared acrylamide solution was mixed with 60 g of cement, and stirred for 3 minutes. Then pour the acrylamide-cement slurry that has been stirred into a mold for molding, remove the formwork for 24 hours, and then cure for 7 days and 28 days to obtain a high-bending cement paste (water-cement ratio of 0.4).

Embodiment 2-5

[0051] This example provides a method for preparing a high-bending cement-based material. The specific steps are roughly the same as in Example 1, except that in Examples 2-5, the mass fractions of acrylamide aqueous solution are 0.6%, 1%, 2%, 5%.

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Abstract

The invention discloses a high-bending-resistance cement-based material and a preparation method thereof, and relates to the technical field of concrete. The high-bending-resistance cement-based material comprises a cement hydrate and a high-molecular polymer chemically bonded with the cement hydrate, wherein the high-molecular polymer is obtained by in-situ polymerization of a polymerization monomer in cement under the action of an initiator and an accelerator. According to the preparation method of the high-flexural-strength cement-based material, the polymerization monomer, the initiator and the accelerator are mixed and dissolved and then subjected to in-situ polymerization in cement, the formed high-molecular polymer and cement hydrate are connected in a chemical bonding mode, and theflexural strength of the cement-based material is effectively improved.

Description

technical field [0001] The invention relates to the technical field of concrete, and in particular to a high-bending cement-based material and a preparation method thereof. Background technique [0002] Polymer-cement composites have high toughness, strain and flexural strength, but the addition of polymers tends to significantly reduce the compressive strength of cement-based materials. When the composite is subjected to a compressive load, the polymer in the polymer The chains will slip in the cement matrix, thereby reducing the compressive strength of the cement matrix. Ordinary concrete has poor flexural and tensile properties, which makes it necessary to be applied to building structures under the condition of steel reinforcement, which greatly limits their practical application. [0003] Therefore, designing cement-based materials with high flexural properties is of great significance for their wide application. Contents of the invention [0004] The purpose of the...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B24/26
CPCC04B24/2652C04B28/00C04B2103/0046C04B2201/50C04B22/14C04B24/121C04B24/04C04B24/124C04B14/06
Inventor 李宗津孙国星梁瑞刘庆
Owner UNIVERSITY OF MACAU
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